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What Is JavaScript?

JavaScript is a lightweight, interpreted programming language. It is designed for creating network-centric applications.

 JavaScript is complementary to and integrated with HTML. The JS statements are placed within the <script> ... </script> tags in a web page. You can place the <script> tag containing JS code anywhere in the web page, but the preferred way to keep it within the <head>...</head> tags.


The <script> tag alerts the browser to interpret all the text between them as a script. The <script> tag has two important attributes: (1) language: specifies what scripting language you are using. (2) type: specifies the Internet media type of a script. For JavaScript, the media type is "text/javascript". 

So the JS segment may look like:
<script 
language="javascript" type="text/javascript"> ……. </script>

<script type="text/javascript"> ……. </script>
<script> .....  </script>

Modern browsers support anyone of the above.

Your First JavaScript program:
<html>
<body>
<script type="text/javascript">
document.write("Hello World!")
</script>
</body>
</html>

Above code will display following result:
Hello World!
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